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We study the impact of triple-leptoquark interactions on matter stability fortwo specific proton decay topologies that arise at the tree- and one-loop levelif and when they coexist. We demonstrate that the one-loop level topology ismuch more relevant than the tree-level one when it comes to the proton decaysignatures despite the usual loop-suppression factor. We subsequently presentdetailed analysis of the triple-leptoquark interaction effects on the protonstability within one representative scenario to support our claim, where thescenario in question simultaneously features a tree-level topology that yieldsthree-body proton decay $p\to e^+ e^+ e^-$ and a one-loop level topology thatinduces two-body proton decays $p\to \pi^0 e^+$ and $p\to \pi^+ \bar{\nu}$. Wealso provide a comprehensive list of the leading-order proton decay channelsfor all non-trivial cubic and quartic contractions involving three scalarleptoquark multiplets that generate triple-leptoquark interactions of ourinterest, where in the latter case one of the scalar multiplets is the StandardModel Higgs doublet.

Triple-leptoquark interactions for tree- and loop-level proton decays